GRHydro_InitData: add parameter for pressure term in poloidal field configuration

The attached patch adds a parameter for an exponent of the pressure term in a poloidal magnetic field configuration. The default is set to 1, maintaining current status. The testsuite using this still passes after applying this patch, with identical files. Once this patch has been applied, there will be a second testsuite added setting the new parameter to something else than the default (but otherwise similar to the now existing one).

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